Search For Multi Lepton Events From Strong And Electroweak Susy Production In Pp Collisions At A Center Of Mass Energy Of 7 Tev
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Search For Multi Lepton Events From Strong And Electroweak Susy Production In Pp Collisions At A Center Of Mass Energy Of 7 Tev
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Author : Peter Thomassen
language : en
Publisher:
Release Date : 2012
Search For Multi Lepton Events From Strong And Electroweak Susy Production In Pp Collisions At A Center Of Mass Energy Of 7 Tev written by Peter Thomassen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Leptons (Nuclear physics) categories.
Physics Briefs
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Author :
language : en
Publisher:
Release Date : 1994
Physics Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Physics categories.
Energy Research Abstracts
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Author :
language : en
Publisher:
Release Date : 1990
Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Power resources categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995-08
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995-08 with Aeronautics categories.
Search For Anomalous Production Of Events With Three Or More Leptons In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2014
Search For Anomalous Production Of Events With Three Or More Leptons In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
A search for physics beyond the standard model in events with at least three leptons is presented. The data sample, corresponding to an integrated luminosity of 19.5 inverse femtobarns of proton-proton collisions with center-of-mass energy sqrt(s) = 8 TeV, was collected by the CMS experiment at the LHC during 2012. The data are divided into exclusive categories based on the number of leptons and their flavor, the presence or absence of an opposite-sign, same-flavor lepton pair (OSSF), the invariant mass of the OSSF pair, the presence or absence of a tagged bottom-quark jet, the number of identified hadronically decaying tau leptons, and the magnitude of the missing transverse energy and of the scalar sum of jet transverse momenta. The numbers of observed events are found to be consistent with the expected numbers from standard model processes, and limits are placed on new-physics scenarios that yield multilepton final states. In particular, scenarios that predict Higgs boson production in the context of supersymmetric decay chains are examined. We also place a 95% confidence level upper limit of 1.3% on the branching fraction for the decay of a top quark to a charm quark and a Higgs boson (t to c H), which translates to a bound on the left- and right-handed top-charm flavor-violating Higgs Yukawa couplings, lambda[H, tc] and lambda[H, ct], respectively, of sqrt(abs(lambda[H, tc])2̂ + abs(lambda[H, ct])2̂)
Search For New Physics In Pp Collisions At 7 Tev Center Of Mass Energy Using Diphoton Events With Large Missing Transverse Energy In The Cms Experiment At The Lhc
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Author : Robert Wayne Stringer
language : en
Publisher:
Release Date : 2011
Search For New Physics In Pp Collisions At 7 Tev Center Of Mass Energy Using Diphoton Events With Large Missing Transverse Energy In The Cms Experiment At The Lhc written by Robert Wayne Stringer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Gauge fields (Physics) categories.
Many theoretical models of physics beyond the Standard Model provide a signature of two photons and large missing transverse energy [Special characters omitted.] in the final state. This search was performed using 36 pb[superscript -1] of proton-proton collision data at [Squared root of s] = 7 TeV. The candidate events are determined by comparing the [Special characters omitted.] distribution for events with two photons and at least one hadronic jet with the [Special characters omitted.] T distribution from QCD and electroweak processes that have no true missing transverse energy. 1.2 ± 0.8 background events were expected, with one event observed. This result was interpreted in two theoretical models beyond the Standard Model. The cross section for General Gauge Mediated Supersymmetry Breaking is given an upper limit between 0.3 pb and 1.1 pb. Universal Extra Dimensions has been excluded for all values of 1/ R
Susy Multilepton Signatures At Tevatron
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Author :
language : en
Publisher:
Release Date : 2007
Susy Multilepton Signatures At Tevatron written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
One of the most striking signature of supersymmetric models with electroweak symmetry breaking is the presence of multilepton event topologies in the decay products. In this paper searches are presented for physics beyond the Standard Model (SM) in final states containing charged leptons from proton-antiproton collision data at a center-of-mass energy of 1.96 TeV, collected with Run II CDF and D0 Detectors in 2002-2006, and corresponding to integrated luminosities of up to 1.1 fb−1. In any of the searches no excess of candidates was observed with respect to the SM predictions and limits on masses and production cross-sections are set at the 95% CL.
A Search For Anomalous Production Of Events With Multiple Leptons And A W Or Z Boson
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Author : Scott Wilbur
language : en
Publisher:
Release Date : 2011
A Search For Anomalous Production Of Events With Multiple Leptons And A W Or Z Boson written by Scott Wilbur and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
A search is presented for anomalous production of events containing multiple low-energy leptons produced in association with a W or Z boson using the Collider Detector at Fermilab. The leptons are not required to be isolated, and the signature is therefore sensitive to a wide range of so-called "lepton jet" topologies. The search uses data corresponding to 5.1 fb--1 of integrated luminosity from pp ̄ collisions at a center-of-mass energy of s = 1.96 TeV. The observed events are compared with the standard model predictions in bins of additional electron and muon multiplicity. No indications are found of phenomena beyond the standard model. A 95% confidence level limit is presented on the production cross section for an example benchmark point of a dark-matter inspired model of supersymmetric hidden valley Higgs production. Object identification efficiencies are also provided in order to enable the calculation of limits on additional models.
Searches For Electroweak Production Of Charginos Neutralinos And Sleptons Decaying To Leptons And W Z And Higgs Bosons In Pp Collisions At 8 Tev
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Author :
language : en
Publisher:
Release Date : 2014
Searches For Electroweak Production Of Charginos Neutralinos And Sleptons Decaying To Leptons And W Z And Higgs Bosons In Pp Collisions At 8 Tev written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Searches for the direct electroweak production of supersymmetric charginos, neutralinos, and sleptons in a variety of signatures with leptons and $\mathrm{W}$, $\mathrm{Z}$, and Higgs bosons are presented. Results are based on a sample of proton-proton collision data collected at center-of-mass energy $\sqrt{s}=8\, \mathrm{TeV}$ with the CMS detector in 2012, corresponding to an integrated luminosity of 19.5 $\, \text {fb}^\text {-1}$ . The observed event rates are in agreement with expectations from the standard model. These results probe charginos and neutralinos with masses up to 720 $\, \text {GeV}$, and sleptons up to 260 $\, \text {GeV}$, depending on the model details.
Search For Anomalous Production Of Multi Lepton Events In P Anti P Collisions At S 1 2
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Author :
language : en
Publisher:
Release Date : 2007
Search For Anomalous Production Of Multi Lepton Events In P Anti P Collisions At S 1 2 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
The authors report a search for the anomalous production of events with multiple charged leptons in p{bar p} collisions at √s = 1.96 TeV using a data sample corresponding to an integrated luminosity of 346 pb−1 collected by the CDF II detector at the Fermilab Tevatron. The search is divided into three-lepton and four-or-more-lepton data samples. They observe six events in the three-lepton sample and zero events in the ≥4-lepton sample. Both numbers of events are consistent with standard model background expectations. Within the framework of an R-parity violating supergravity model, the results are interpreted as mass limits on the lightest neutralino ({bar {chi}}1°) and chargino ({bar {chi}}1{sup {+-}}) particles. For one particular choice of model parameters, the limits are M({bar {chi}}1°) > 110 GeV/c2 and M({bar {chi}}1{sup {+-}}) > 203 GeV/c2 at 95% confidence level; the variation of these mass limits with model parameters is presented.